/dɪ'dʌkʃn; dɪ`dʌkʃən/
n ~ (from sth)
1 (a) [U] reasoning from general principles to a particular case; deducing 推演; 推理; 演绎
*a philosopher skilled in deduction 擅长推理的哲学家.
(b) [C] conclusion reached by reasoning （推理所得出的）结论
*It's an obvious deduction that she is guilty. 推断出的明显结论是她有罪. Cf 参看 induction 3.
2 (a) [U] deducting 扣除; 减除
*the deduction of tax from earnings 从收入中扣除税金.
(b) [C] amount deducted 扣除的量
*deductions from pay for insurance and pension 自工资中扣出作保险金和退休金的数额.

n [U and C]
the process of using the knowledge or information you have in order to understand something or form an opinion, or the opinion that you form
　Children will soon make deductions about the meaning of a word.
the process of taking away an amount from a total, or the amount that is taken away
　After deductions for tax etc, your salary is about £700 a month.